body.dark-mode {
  background-color: #121212;
  color: #fff;
  font-family: 'Ubuntu', sans-serif;
  margin: 0;
  padding: 0;
}

header {
  display: flex;
  justify-content: space-between;
  padding: 1em;
  background: #1e1e1e;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  width: 100%;
  background: #000;
  display: flex;
  justify-content: space-around;
  padding: 0.5em 0;
}

.fab {
  position: absolute;
  right: 1em;
  bottom: 3em;
  border-radius: 50%;
  width: 3em;
  height: 3em;
  font-size: 1.5em;
}